Stoker



May 27, 1930. J. c. HEAVEY l STOKER s sheets-smet 1 has?? 7 Filed March 5, 1923 O O O O O O O O n 0 mK www mw: L o

'May 27, 1930.

J. C. HEAVEY STOKER- Filed March 5, 1923 `5 Sheets-Sheet 2 4Mayn27, 1930. J. c. HEAVEY sToKER Filed March 5, 192:5 :s sheets-sheet s .ilo

Patented May 27, 1930 N UNITEDrsTA-Tss JOHN c. IIEAVEY, or CHICAGO, ILLINOIS STOKER Application mea March 5, 1923.` serial No. 622,890.

This invention relates to stokers ,and more particularly to chain grate stokers and means forcontrolling the air therethrough and is fully described in the following specification and shownin the accompanying drawings in which `Figure 1 is a vertical longitudinal section through a Stoker,

Fig. 2 is atransverse vertical section on line 2 of Fig. 1,

Fig. 31s a partial horizontal section on the line 3-3 of Fig. 1 and partial plan and Fig. 4 is a partialv side elevation of the furnace front. 1 1

The embodiment shown comprises a Stoker having the traveling chain grate l() running over front and rear sprockets 11 and 12 respectively. These are secured to shafts 13 and 14 which are journaled in the frame 15, which is mounted on wheelsf16 and 17 adapted to run on the track 18, so that the stoker c an be moved `into and out of the boiler sett1n.`

" Fha arch 19 of the combustion chamber overlies the Stoker and has a front 20 to which 23 and when covered with a layer of ash 26 prevents the passage of air through the forward end of the fuel bed 27 before it reaches the desiredzone ofcombustion.

A series of transversely extending boxes 28, 29, 30 and 31 are distributed throughout the stoker so as to divide the space beneath the grate into la series of compartments A, B, C

p and D." These boxes are wide enough on top to receive layers of ashes 32 which cooperate with the chain grate to prevent air passing in appreciable quantities from one compartment to the next.

The last plate 31 is secured t`o a channel 33 which extends across the stoker and carries an apron member 34 which is secured thereto with one side resting upon the lower strand of the chain grate. Plates 35 and 36 are also carried by the Stoker frame, the plate 36 resting upon the top of the wall 37 of the ash pit 38 so .that ashes V39 will cooperate with the apron 34 to prevent cold air from beneath the stoker passing around and into the space 40 at the back of the stolzer.

Each of the boxes 28, 29 and 30 in addition to the top and two side walls, as shown in section in Fig. 1, has a slidable bottom 28a, 29a

and 30a, respectively. The bottom 28au is connected through links 42 and levers 43 to the shaft 44 which is operable by means of a hand lever 45 from the front of the furnace. The other sliding bottoms 29a and 30a are likewise connected to shafts 46 and 47, respectively, which are operable by hand levers 48 and 49. It will be observed that in Fig. 1 the`sliding bottoms 28a and 295L are drawn beneath the boxes 28 and 29 so as to leave compartments B and C in communication with theair beneath the Stoker, and that with the hand lever 49`in the position shown in Fig. 4 the slidingbottom 3()a is moved to a position (Fig. 1) closing the bottom of the compartment D so that no air is drawn through this compartment, and hence through the fuel above it.

It will be understood from the foregoing that the arrangement shownand described is for a furnace operating on flue draft and that by opening and closing the bottoms 28a,

29a and 30al the amount of air fed through the compartments B, C and D may be regu-` lated so as to control the combustion of the fuel in the furnace chamber. `While no means isshown for similarly controlling the iiow of air throughthe compartment A, it will be understood that a similar slide bottom may be used for this compartment if desired.

This permits of a very nice regulation of the combustion of the fuel on the traveling grate so that the fuel may be completelyco-nsumed without at the same time passing through it much more air than is needed for its complete combustion. `In this way the fuel is completely burned, andat the` inner end of the grate only ash is left which is dumped into pit 38 as the chain grate passes y around the sprocket 12.

' is capable of many modifications. Changes,

therefore, in the construction may be made which do not depart from the spirit and scope of the appended claims, in which it is my intention to cover all novelty inherent in the same as broadly as possible in view of the prior art.

What I claim as new, and desire to secure by Letters Patent, is: s

1. A Stoker comprising a continuous chain grate, a series of partitions inthe space beneath the upper part of said grate dividing said space into a series of compartments, said partitions lying some distance beneath the bottom of said upper part, and being fiat on top and adaptedto support ashes on their top portions to cooperate with said upper part to prevent passage of air from one compartment to the next, each partition being hollow, and a member slidable into position beneath said partition and slidable therefrom to close the bottom of a compartment whereby the passage of air through said compartment may be controlled.

2. A Stoker comprising a continuous chain grate, a series of partitions in the space beneath the upper part of said, gratev dividing said s ce into a series of compartments, said partitlons being flat on top and adapted to support ashes on their top portions to cooperate With said upper part to prevent passage of air from one com artment to the next, each partition being ho low, a member slidable into position beneath said partition and slidable therefrom to close the bottom of a compartment, whereby the passage of air through said compartment may be controlled, and means o rable from the front of said Stoker for shifting said member.

3; A Stoker comprising a continuous chain grate, a series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, ssid'partitions being flat on top and adapte-d to support ashes on their top portions to cooperate with said chain grate to prevent passage of air from one compartment to the next, each partition being hollow, a member slidable into osition beneath said partition and slidable therefrom to close the bottom of a compartment, whereby the `passage of air through said compartment may be controlled,

and a lever operable from the front of said Stoker for shifting said member.

4. A stoker comprising a continuous chain grate, a series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, said partitions lying some distance beneath the bottom of said upper part, and being flat on top and adapted to support ashes on their top portions to cooperate with said upper part to prevent passage of air from one compartment to the next, and a member slidable into position beneath said partition and slidable therefrom to close the bottom of a compartment whereby the passage of air through said compartment may be controlled, each partition being wider than said slidable member so as to permit the latter to be withdrawn thereunder.

. 5. A Stoker comprising a continuous, chain grate, a series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, said partitions lying some distance beneath the bottom of said upper part, and vbeing flat on top and adapted to support ashes on their top portions to cooperate with said upper part to prevent passage of air from one compartment to the next, and a horizontally disposed member slidable into position beneath said partition and slidable therefrom to close the bottom of a compartmentl whereby the passage of air through said compartment may be controlled, each partition being wider than said slidable member so as to permit the latter to be withdrawn thereunder, that edge of said partitionunder which the slidable member moves lying closely adjacent thereto so as to scrape od any ash accumulated thereon as' said member is retracted.

6, A stoker comprising a continuous chain grate,r a series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, said partitions lying some distance beneath the bottom of said upper part, and being flat on top and adapted to support ashes on their top portions to cooperate with said upper part to prevent passage of air from one compartment to the next, and a member slidable into position beneath said partition and slidable therefrom to close the bottom of a compartment whereby the passage of air through said compartment may be controlled, said slidable member being adapted when closed to catch ashes sifting through the upper part of said grate to further seal, the same.

7. In combination with a furnace, a stoker entering a combustion opening therein, said Stoker comprising a continuous chain grate, a series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, said partitions lying some distance beneath the bottom of said upper part, and being flat on top and adapted to support ashes on their top portions to (zo-operate with said vupper part to prevent passage of air from one compartment to the neXt, members slidable into p0- sition beneath said partitions and slidable therefrom to close the bottoms of the compartments whereby theA passage of air through said compartments may be controlled, and a plate positioned below said upper part of the Stoker where the latter enters the opening of thefurnace, said plate being adaptedV to support ashes and to cooperate with the upper part of the grate to seal the entering portion of the upper part of the Stoker.

8p. In combination with a furnace, a stoker entering the combustion opening thereof, said Stoker comprising a continuous chain grate, a `series of partitions in the space beneath the upper part of said grate dividing said space into a series of compartments, said partitions being Hat on top and adapted-to support ashes on their top portions, to Vc0- operate with said chain grate to prevent passage of air, from one compartment to the next, members slidable into position beneath said partitions and slidable therefrom t0 t closethe bottoms of the compartments whereby thepassage of air through said compartment may be controlled, a plate located at the front of saidstoker where the latter enters the furnace opening, said plate being spacedbelow the upper part of the chain grate and being adapted to support ashes to seal the entering portion of said upper part,

land Vmeans positioned below said plate for operating said slidable members to open or close said compartments.

J OHN C. HEAVEY. 

